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Business Segments and Revenue from Contracts with Customers - Revenue from Contracts with Customers (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of Revenue [Line Items]        
Total contract revenue $ 982 $ 942 $ 2,724 $ 2,805
Revenue from other sources 844 280 1,422 1,087
Non-interest income 1,826 1,222 4,146 3,892
Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 812 737 2,239 2,228
Revenue from other sources 201 133 530 630
Non-interest income 1,013 870 2,769 2,858
Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 101 156 316 453
Revenue from other sources 6 9 14 38
Non-interest income 107 165 330 491
Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 68 51 171 129
Revenue from other sources 169 170 484 479
Non-interest income 237 221 655 608
Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1 (2) (2) (5)
Revenue from other sources 468 (32) 394 (60)
Non-interest income 469 (34) 392 (65)
Interchange fees, net        
Disaggregation of Revenue [Line Items]        
Total contract revenue 775 790 2,199 2,368
Interchange fees, net | Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 703 722 2,003 2,181
Interchange fees, net | Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 54 54 152 152
Interchange fees, net | Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 17 15 45 39
Interchange fees, net | Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1 (1) (1) (4)
Service changes and other customer-related fees        
Disaggregation of Revenue [Line Items]        
Total contract revenue 92 110 260 312
Service changes and other customer-related fees | Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 0 0 0 0
Service changes and other customer-related fees | Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 42 76 137 225
Service changes and other customer-related fees | Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 50 35 124 88
Service changes and other customer-related fees | Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue 0 (1) (1) (1)
Other contract revenue        
Disaggregation of Revenue [Line Items]        
Total contract revenue 115 42 265 125
Other contract revenue | Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 109 15 236 47
Other contract revenue | Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 5 26 27 76
Other contract revenue | Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1 1 2 2
Other contract revenue | Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue $ 0 $ 0 $ 0 $ 0